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Uninstalling Windows using the Command Prompt By zypherg
One option included in Windows XP is the ability to uninstall XP if you were able to performed an upgrade from Windows 98, 98SE, or Windows Me. The usual method of uninstalling XP is done by booting into XP normally and uses the Add/Remove Programs tool in Control Panel. If you are unable to normally start XP, another option is to load XP in Safe Mode then use the same procedure. If unsuccessful to boot normally or boot into Safe Mode, XP can be removed by uninstalling from a Command Prompt. Here are the steps:
Important Note: This procedure is available only if a successful image of the previous operating system was created during the XP upgrade.
This can only done if you are logged on as a user with administrative rights or, and ofcurse as Administrator.
1. Boot the computer to Safe Mode (press F8 simultaneously before the windows appear).
2. On the command prompt, just type cd\, and press ENTER.
3. Type “cd\windows\system32”, then press ENTER.
4. Type “osuninst.exe”, and then press ENTER.
5. An on screen instructions will appear and guide you through out the uninstall process to revert to the previous operating system.